The absorption spectrum of a plant shows what wavelengths of light the plant absorbs. The absorption spectrum depends on
A) wavelengths of light to which the plant's pigments respond. B) the thickness of the plant's leaves. C) wavelengths of light that are transmitted by the plant. D) the wavelengths of light that hit the plant.
What event accompanies energy absorption by chlorophyll or other pigment molecules of the antenna complex)?
A) A carboxylation reaction of the Calvin cycle occurs. B) Electrons are stripped from NADPH. C) An electron is excited. D) ATP is synthesized from the energy absorbed.
Energy from sunlight can excite electrons, kicking them out of their orbitals and creating free radicals. Free radicals are highly reactive atoms or molecules that have unpaired electrons. They degrade and destroy other compounds in their vicinity. Carotenoids, one of the pigments present in most chloroplasts, can stabilize these free radicals. This suggests that
A) carotenoids probably have a protective function in the cell. B) once chloroplasts are destroyed, the free radicals will destroy the cell. C) other pigments besides carotenoids and chlorophyll) are essential for the health of a plant cell. D) carotenoids communicate directly with the immune system of plants.